I had to change my trans fluid a few times and the washer wasn't doing its thing properly so I smeared a small amount of the white Loctite (567?) thread sealing paste on the fill bolt, no issues with it leaking and wasn't crazy tight to undo later. I would think tape will be fine, I used the paste as that is what I found first in the tool box....
cheers
Redd
2003 D2a "The Red Rig" TD5 auto, (number 1 son is now the operator)
2003 D2a "White Weapon" TD5, auto, 17" BFG's and more to follow
Almost qualified as a Land Rover operator
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